LTTIX vs. SSFNX

Last updated Jun 3, 2026

LTTIX (MFS Lifetime 2025 Fund) and SSFNX (State Street Target Retirement Fund) are both Target Retirement Date funds. Over the past 10 years, LTTIX returned 6.24%/yr vs 5.87%/yr for SSFNX. Their correlation of 0.94 suggests significant overlap in exposure. LTTIX charges 0.00%/yr vs 0.10%/yr for SSFNX.

Performance

LTTIX vs. SSFNX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Lifetime 2025 Fund (LTTIX) and State Street Target Retirement Fund (SSFNX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, LTTIX achieves a 2.74% return, which is significantly lower than SSFNX's 5.40% return. Over the past 10 years, LTTIX has outperformed SSFNX with an annualized return of 6.24%, while SSFNX has yielded a comparatively lower 5.87% annualized return.

LTTIX

• 1D: 0.00%
• 1M: 0.14%
• YTD: 2.74%
• 6M: 3.14%
• 1Y: 9.01%
• 3Y*: 8.33%
• 5Y*: 3.76%
• 10Y*: 6.24%

SSFNX

• 1D: -0.08%
• 1M: 1.19%
• YTD: 5.40%
• 6M: 5.73%
• 1Y: 12.90%
• 3Y*: 9.87%
• 5Y*: 4.47%
• 10Y*: 5.87%

*Multi-year figures are annualized to reflect compound growth (CAGR)

LTTIX vs. SSFNX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
LTTIX MFS Lifetime 2025 Fund	2.74%	9.29%	6.73%	10.36%	-12.36%	8.61%	10.61%	17.82%	-3.97%	13.16%
SSFNX State Street Target Retirement Fund	5.40%	10.93%	7.05%	10.73%	-12.21%	6.87%	10.26%	13.97%	-2.49%	8.92%

Correlation

The correlation between LTTIX and SSFNX is 0.93, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.93
Correlation (3Y) Calculated over the trailing 3-year period	0.95
Correlation (5Y) Calculated over the trailing 5-year period	0.97
Correlation (10Y) Calculated over the trailing 10-year period	0.95
Correlation (All Time) Calculated using the full available price history since Oct 2, 2014	0.94

The correlation between LTTIX and SSFNX has been stable across timeframes, ranging from 0.93 to 0.97 - a consistent structural relationship.

Return for Risk

LTTIX vs. SSFNX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

LTTIX

LTTIX Risk / Return Rank: 54
LTTIX Sharpe Ratio Rank: 54
LTTIX Sortino Ratio Rank: 59
LTTIX Omega Ratio Rank: 58
LTTIX Calmar Ratio Rank: 45
LTTIX Martin Ratio Rank: 56

SSFNX

SSFNX Risk / Return Rank: 88
SSFNX Sharpe Ratio Rank: 91
SSFNX Sortino Ratio Rank: 90
SSFNX Omega Ratio Rank: 88
SSFNX Calmar Ratio Rank: 81
SSFNX Martin Ratio Rank: 88

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

LTTIX vs. SSFNX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Lifetime 2025 Fund (LTTIX) and State Street Target Retirement Fund (SSFNX). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.

	LTTIX	SSFNX	Difference
Sharpe ratio Return per unit of total volatility	2.18	3.00	-0.83
Sortino ratio Return per unit of downside risk	3.23	4.41	-1.19
Omega ratio Gain probability vs. loss probability	1.43	1.62	-0.19
Calmar ratio Return relative to maximum drawdown	2.59	3.75	-1.17
Martin ratio Return relative to average drawdown	11.24	17.09	-5.85
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

LTTIX vs. SSFNX - Sharpe Ratio Comparison

The current LTTIX Sharpe Ratio is 2.18, which is comparable to the SSFNX Sharpe Ratio of 3.00. The chart below compares the historical Sharpe Ratios of LTTIX and SSFNX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	LTTIX	SSFNX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.18	3.00	-0.83
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.59	0.68	-0.09
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.86	0.90	-0.03
Sharpe Ratio (All Time) Calculated using the full available price history	0.86	0.84	+0.02

Drawdowns

LTTIX vs. SSFNX - Drawdown Comparison

The maximum LTTIX drawdown since its inception was -19.33%, which is greater than SSFNX's maximum drawdown of -16.62%. Use the drawdown chart below to compare losses from any high point for LTTIX and SSFNX.

Drawdown Indicators

	LTTIX	SSFNX	Difference
Max Drawdown Largest peak-to-trough decline	-19.33%	-16.62%	-2.71%
Max Drawdown (1Y) Largest decline over 1 year	-3.64%	-3.52%	-0.12%
Max Drawdown (3Y) Largest decline over 3 years	-5.77%	-5.40%	-0.37%
Max Drawdown (5Y) Largest decline over 5 years	-16.92%	-16.62%	-0.30%
Max Drawdown (10Y) Largest decline over 10 years	-19.33%	-16.62%	-2.71%
Current Drawdown Current decline from peak	-0.45%	-0.08%	-0.37%
Average Drawdown Average peak-to-trough decline	-2.68%	-2.52%	-0.16%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.84%	0.77%	+0.07%

Volatility

LTTIX vs. SSFNX - Volatility Comparison

MFS Lifetime 2025 Fund (LTTIX) and State Street Target Retirement Fund (SSFNX) have volatilities of 1.41% and 1.40%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	LTTIX	SSFNX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.41%	1.40%	+0.01%
Volatility (6M) Calculated over the trailing 6-month period	3.33%	3.54%	-0.21%
Volatility (1Y) Calculated over the trailing 1-year period	4.19%	4.39%	-0.20%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.38%	6.58%	-0.20%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	7.25%	6.57%	+0.68%

LTTIX vs. SSFNX - Expense Ratio Comparison

LTTIX has a 0.00% expense ratio, which is lower than SSFNX's 0.10% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

LTTIX vs. SSFNX - Dividend Comparison

LTTIX's dividend yield for the trailing twelve months is around 11.54%, more than SSFNX's 4.61% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
LTTIX MFS Lifetime 2025 Fund	11.54%	8.13%	7.07%	3.30%	5.88%	7.35%	2.83%	3.68%	4.32%	3.51%	4.03%	1.82%
SSFNX State Street Target Retirement Fund	4.61%	4.86%	5.78%	5.26%	5.12%	6.69%	1.61%	3.35%	4.40%	2.72%	1.84%	2.05%

Frequently Asked Questions

Can I hold both LTTIX and SSFNX in my portfolio?

With a correlation of 0.93, LTTIX and SSFNX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, LTTIX or SSFNX?

LTTIX has higher volatility (1.41%) compared to SSFNX (1.40%). In terms of maximum drawdown, LTTIX dropped -19.33% vs SSFNX's -16.62%.

Which has better risk-adjusted returns?

SSFNX currently has the higher Sharpe Ratio (3.00 vs 2.18), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.